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I have checked in the information of your Yonex Armortec 900 Technique shaft Serial:7061055; Cone Code:030872BX (date=03 Aug 2007) to my information list of Yonex rackets made in Japan, its shaft serial and cone code are legitimate.

However you still need to inspect the other physical features of the racket carefully and compare the specifications to ascertain its total legitimacy or authenticity yourself.

I have checked in the information of your YonexArc Saber Z slash shaft Serial:8795835; Cone Code:051092IP (date=05 Oct 2009) to my information list of Yonex rackets made in Japan, its shaft serial and cone code are legitimate.

However you still need to inspect the other physical features of the racket carefully and compare the specifications to ascertain its total legitimacy or authenticity yourself.

I have checked in the information of your YonexNanoSpeed 9900 shaft Serial:8674853; Cone Code:030892CH (date=03 Aug 2009) to my information list of Yonex rackets made in Japan, its shaft serial and cone code are legitimate.

However you still need to inspect the other physical features of the racket carefully and compare the specifications to ascertain its total legitimacy or authenticity yourself.

basically what ryim says, but keeping a spreadsheet helps.
However, some rackets have been found, to be have legit serials and cone codes, but that doesn't mean it is legit, you have to check paint, fonts, decals etc. If possible, with a freinds racket. To confirm authenticity

Most definitely. When leeshim verifies our rackets, he explicit says to check other physcial details in order to make sure that a racket is genuine. Also, purchasing a racket from a reputable store minimizes the chance of purachasing a counterfeit as opposed to a seller on ebay.

I have checked in the information of your YonexNanoSpeed 6000 shaft Serial:8391773; Cone Code:190393FR (date=19 Mar 2009) to my information list of Yonex rackets made in Japan, its shaft serial and cone code are legitimate.

However you still need to inspect the other physical features of the racket carefully and compare the specifications to ascertain its total legitimacy or authenticity yourself.

I have checked in the information of your YonexArmortec 700 shaft Serial:8241560; Cone Code:290199SP (date=29 Jan 2009) to my information list of Yonex rackets made in Japan, its shaft serial and cone code are legitimate.

However you still need to inspect the other physical features of the racket carefully and compare the specifications to ascertain its total legitimacy or authenticity yourself.